I bought few of these LCDs from Taobao a few months back. Thought they were 240x64 or similar things. Once I received it, I noticed the one of the screens I ordered also had another model name on the board: ML40D255064D8. While searching this number on Google didn't return anything useful, it gives me some clue about the resolution: 255x64. Then I could do the usual reverse-engineering thing, as described in the blog several times. Basically, with the resolution and the driver IC die size I could determine the controller model, then by just looking at the FPC and board I could derive the pinout.
The screen uses the ST7529 controller, supports up to 32 level of greyscale by using 2 frame FRC + 4 bit PWM. The default setting might not give the optimal result, but the greyscale could be finetuned by setting the registers in the controller.
With backlight off:
Demo (Showing Raiden Shogun from Genshin Impact):